Improved all CI workflow to run on GitHub Action (#297)

Tried different workflows, both Circle CI appveor and Travis CI, now settled on GH Actions

.github/workflows/ci.yaml

@@ -0,0 +1,34 @@
+name: Continuous Integration
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-20.04, macos-12, macos-11, windows-2022, windows-2019]
+        python-version: [ "3.6", "3.7", "3.8", "3.9", "3.10", "pypy3.7", "pypy3.8", "pypy3.9", ]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v2
+      - name: Set up python
+        id: setup-python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Print Python Information
+        run: python -VV
+      - name: Updating dependencies
+        run: python -m pip install -U pip poetry
+      - name: install TinyTeX
+        uses: r-lib/actions/setup-tinytex@v2
+      - name: Install PyPandoc environment
+        run: poetry install
+      - name: Download pandoc
+        run: poetry run python setup_binary.py download_pandoc
+      - name: run tests
+        run: poetry run python tests.py